V4L/DVB (6547): V4L: remove PCI from VIDEO_VIVI depends

vivi.c is a virtual driver that builds without PCI and should run on
non-pci hardware.

Signed-off-by: Brandon Philips <bphilips@suse.de>
Signed-off-by: Mauro Carvalho Chehab <mchehab@infradead.org>